JP2001099037A - Starter motor waterproof structure for small vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the intrusion of water to a starter motor to stabilize the starting of an engine by the starter motor. SOLUTION: In a small vessel comprising an engine 3 and a propeller driven by the engine 3, a starter motor 16 (a starter motor body 16A and a magnet switch 17) provided on the engine 3 is substantially closely covered with halved covers 18, 19. Since the starter motor 16 is substantially closely covered with the covers 18, 19, the intrusion of water to the starter motor 16 can be prevented by the covers 18, 19, and the starting of the engine 3 by the starter motor 16 can be stably performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a waterproof structure for a starter motor of a small boat.

[0002]

2. Description of the Related Art Generally, an engine is provided with a starter motor for starting the engine, and the engine is started by cranking the engine with the starter motor.

[0003]

By the way, in a small boat equipped with a propulsion device driven by an engine,
Seawater or the like may enter the starter motor, and the cost of the starter motor may be increased in order to take sufficient measures against rust of the starter motor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to prevent water from entering the starter motor while preventing rust of the starter motor from being easily achieved. It is an object of the present invention to provide a waterproof structure for a starter motor of a small boat, which can stably start an engine by the motor.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the invention according to claim 1 provides an engine and a starter motor provided in the engine of a small boat having a propulsion device driven by the engine. The structure is characterized in that the starter motor is covered with a cover in a substantially sealed state.

According to a second aspect of the present invention, in the first aspect of the present invention, the cover is divided into two parts, and one of the covers and the starter motor are attached to the engine body by tightening together, and the opening of the one cover is closed. It is characterized by being covered with the other cover.

According to a third aspect of the present invention, in the second aspect of the present invention, the two divided covers are attached to the engine body by tightening together.

Therefore, according to the first aspect of the present invention, since the starter motor is covered with the cover in a substantially sealed state,
Water is prevented from entering the starter motor by the cover,
The start of the engine by the starter motor can be stably performed.

According to the second aspect of the present invention, the cover for covering the starter motor is divided into two parts, and one of the covers and the starter motor are attached to the engine body by fastening together, and the opening of the one cover is covered with the other cover. According to the third aspect of the present invention, since the two divided covers are attached to the engine body by tightening together, the cover and the starter motor can be efficiently attached and detached at a time, and if the other cover is removed. Since the starter motor is exposed from the opening of the one cover, maintainability of the starter motor is improved.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a side view of a personal watercraft provided with a waterproof structure for a starter motor according to the present invention, and FIG. 2 is a plan view of the personal watercraft.

A personal watercraft 1 shown in FIGS. 1 and 2 has a hull 2a having a substantially V-shaped cross section and a deck 2b mounted on an upper portion thereof.
And a hull 2a of the hull 2 has a four-stroke engine 3 at a substantially central portion of the hull 2a in the front-rear direction. It is mounted to extend. A fuel tank 4 is disposed in front of the engine 3 (the direction of the arrow F in FIGS. 1 and 2 is in front of the hull 2).
Is covered by a hatch cover 5 and a pair of left and right cover members 6, and a steering handle 7 is provided above the engine 3 on the upper surface of the deck 2b.

An upper end of a pair of left and right intake ducts (ventilation hoses) 8 is opened in front of the steering handle 7 of the deck 2b constituting the boat body 2.
A seat 9 is detachably provided behind the steering handle 7, and a storage box 10 is provided below a rear portion of the seat 9.
Are arranged. Each intake duct 8 communicates the interior of the hull 2 with the atmosphere to supply intake air to the engine 3 and
It is for ventilating inside.

On the other hand, as shown in FIG. 1, at the rear end of the hull 2 and at the center of the hull 2 in the width direction, the jet propulsion unit 1
1 is disposed, and a crankshaft 12 of the engine 3 is provided.
The front end of an impeller shaft 13 extending in the front-rear direction at the center in the width direction of the hull 2 is connected to a rear end of the boat body 2 by a coupling 14. The impeller shaft 13 is introduced into the jet propulsion device 11, and the rear end of the impeller shaft 13 is
An impeller (not shown) built in the pump chamber is mounted. At the rear end of the jet propulsion device 11, a steering nozzle 15 whose direction changes left and right by a steering operation of the steering handle 7 is swingably attached.

Thus, the personal watercraft 1 having the above configuration
When the jet propulsion device 11 is driven by the engine 3, the personal watercraft 1 slides on the water by the thrust generated in the jet propulsion device 11. Incidentally, a magnet switch may be incorporated in the starter motor main body to eliminate the separate magnet switch, or the magnet switch itself may be eliminated.

Here, the waterproof structure of the starter motor according to the present invention will be described in detail with reference to FIGS. FIG.
Fig. 4 is a front view of a part of the engine (starter motor portion) cut away, Fig. 4 is a bottom view of the engine, Fig. 5 is a side view of the starter motor portion of the engine with one cover removed, and Fig. 6 is a diagram. FIG. 5 is a sectional view taken along line AA of FIG.

A starter motor 16 is provided on one side (left side in FIG. 3) of the cylinder block 3a of the engine 3. The starter motor 16 is provided integrally with a starter motor main body 16A and an upper portion thereof. And a magnet switch 17. A drive gear 24 is provided at the end of the starter motor main body 16A so as to be movable in the axial direction of the output shaft. And the crankshaft 12
(See Fig. 1) At the tip of the flywheel magneto 25
And a driven gear 26 that rotates integrally with the flywheel magneto 25. The drive gear 24
Is configured to be able to mesh with the driven gear 26 via a reduction gear train (not shown). When the engine 3 is started, the starter motor main body 16A is driven, and its rotation is reduced by an example of a reduction gear, and the driven gear 26 and Crankshaft 12
, The required cranking is performed, and the cranking starts the engine 3.

By the way, the magnet switch 17 and the starter motor main body 16A which are arranged in the upper and lower two stages are
As shown in FIG. 6 and FIGS.
It is covered in a substantially hermetically closed shape. Normally, the drive gear 24 and the driven gear 26 are separated in the axial direction of the output shaft of the starter motor main body 16A, but when starting the engine 3, a starter switch provided at one end of the steering handle 7 is pressed. And the magnet switch 17 is O
N, the drive gear 24 moves forward and meshes with the driven gear 26 to rotate the crankshaft 12. When the rotation of the crankshaft 12 becomes equal to or more than a predetermined value after the start of the engine 3, the magnet switch 17 is turned off, the drive gear 24 is retracted, and the engagement with the driven gear 26 is released.

As shown in FIG. 4, the two divided covers 18 and 19 form a tapered surface, and one cover 18 and the starter motor body 16A are fixed to the cylinder block 3a by tightening together. Installed. That is, as shown in FIG.
Flanges 16a are integrally formed at three locations on the outer periphery of 6A, and brackets are provided at three locations (three locations corresponding to the flange portions 16a of the starter motor main body 16A) where the cover 18 meets the cylinder block 3a. The starter motor body 16A and the cover 1
8, as shown in FIG.
a and three bolts 20 to be inserted into the bracket portion 18a
And are attached to the cylinder block 3a. By attaching the starter motor main body 16A to the cylinder block 3a in this way, the magnet switch 17 provided integrally with the starter motor main body 16A is also fixed to the cylinder block 3a via the starter motor main body 16A. As shown in FIG. 6, a sealing gasket 21 is interposed between the cover 18 and the cylinder block 3a.

The covers 18, 19 are also attached to the cylinder block 3a by fastening together. That is, as shown in FIG. 5, a plurality of (seven in the illustrated example) circular holes 18 b are formed through the mating surface of one cover 18 with the other cover 19, and the outer peripheral flange of the other cover 19 is formed. A circular hole 19b is formed in a portion of the portion 19a corresponding to the circular hole 18b (see FIG. 6).

As shown in FIG. 6, one cover 1 has a sealing gasket 22 interposed therebetween.
8 is screwed into the cylinder block 3a by fitting the other cover 19 to the mating surface (opening) 8 and screwing the bolts 23 inserted into the circular holes 18b, 19b formed in the covers 18, 19, respectively, in communication with each other. Both covers 18, 19 are fastened together by a plurality of (seven in total) bolts 23 and attached to the cylinder block 3a.

As described above, the starter motor body 1
As described above, the starter motor 16 including the 6A and the magnet switch 17 is hermetically and water-tightly covered by the two divided covers 18 and 19.

In this embodiment, since the starter motor main body 16A of the starter motor 16 and the magnet switch 17 are covered in a substantially hermetically sealed and watertight manner by the covers 18 and 19, the starter motor main body 16A
Intrusion of water into A and the magnet switch 17 is the cover 1
Thus, the starter motor 16 can stably start the engine 3.

In this embodiment, the starter motor main body 16A and the magnet switch 17 constituting the starter motor 16 are covered by two divided covers 18 and 19, and one cover 18 and the starter motor main body 16A are shared. Since the cover 18 and the split cover 18 were attached to the cylinder block 3a by joint fastening together with the cylinder block 3a by fastening, the cover 1
Attachment and removal of the starter motor 16 and the starter motor 16 are efficiently performed at the same time, and the maintainability of the starter motor 16 is improved.

Although the present invention has been described with reference to the case where the present invention is particularly applied to a starter motor of a personal watercraft, the present invention is similarly applicable to a starter motor of any other small boat. Of course.

[0026]

As is apparent from the above description, according to the present invention, a starter motor provided in the engine of a small boat equipped with a propulsion device driven by the engine is provided in a substantially sealed state by a cover. As a result, it is possible to prevent the intrusion of water into the starter motor by the cover, and to stably start the engine by the starter motor.

[Brief description of the drawings]

FIG. 1 is a side view of a personal watercraft equipped with a waterproof structure for a starter motor according to the present invention.

FIG. 2 is a plan view of a personal watercraft equipped with a waterproof starter motor structure according to the present invention.

FIG. 3 is a front view in which a part of an engine (a starter motor part) is broken.

FIG. 4 is a bottom view of the engine.

FIG. 5 is a right side view in a state where one cover of a starter motor portion of the engine is removed.

FIG. 6 is a sectional view taken along line AA of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Small personal watercraft (small boat) 3 Engine 3a Cylinder block (engine body) 11 Jet propulsion device (propulsion device) 16 Starter motor 18, 19 Cover

Claims (3)

[Claims] 1. A waterproof structure for a starter motor provided in an engine of a small boat having an engine and a propulsion device driven by the engine, wherein the starter motor is covered with a cover in a substantially sealed manner. Features a waterproof starter motor structure for small vessels. 2. The apparatus according to claim 1, wherein the cover is divided into two parts, one of the covers and the starter motor are attached to the engine body by fastening together, and the opening of the one cover is covered with the other cover. A starter motor waterproof structure for a small boat as described in the above. 3. The waterproof structure for a starter motor of a small boat according to claim 2, wherein said two divided covers are attached to an engine body by fastening together.